package org.shop.weixin.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.shop.weixin.service.CoreService;
import org.shop.weixin.util.SignUtil;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * Controller - 微信请求处理的核心类
 * 
 * @author 友木科技 Team
 * @version 3.0
 */
@Controller("weixinController")
@RequestMapping("/weixin")
public class weixinController {

    /**
     * 请求校验（确认请求来自微信服务器）
     * @return 
     */

    @RequestMapping(method = RequestMethod.GET)
    public @ResponseBody
    String doGet(HttpServletRequest request, HttpServletResponse response) {
        // 微信加密签名
        String signature = request.getParameter("signature");
        // 时间戳
        String timestamp = request.getParameter("timestamp");
        // 随机数
        String nonce = request.getParameter("nonce");
        // 随机字符串
        String echostr = request.getParameter("echostr");
        System.out.println("signature" + signature + "timestamp" + timestamp + "nonce" + nonce
                           + "echostr" + echostr);
        // 请求校验，若校验成功则原样返回echostr，表示接入成功，否则接入失败
        if (SignUtil.checkSignature(signature, timestamp, nonce)) {
            return echostr;
        }

        return null;
    }

    /**
     * 处理微信服务器发来的消息
     */
    @RequestMapping(method = RequestMethod.POST)
    public void doPost(HttpServletRequest request, HttpServletResponse response)
                                                                                throws ServletException,
                                                                                IOException {
        // 将请求、响应的编码均设置为UTF-8（防止中文乱码）
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");

        // 调用核心业务类接收消息、处理消息
        String respXml = CoreService.processRequest(request);

        // 响应消息
        PrintWriter out = response.getWriter();
        out.print(respXml);
        out.close();
    }
}
